RACH type selection and different sets of RACH parameters

Abstract

A UE may receive, from a base station, a configuration for a plurality of parameter sets that each include one or more parameters for a RACH message and are each associated with one of TDM, FDM, or SDM. The UE may determine a transmission type of the RACH message corresponding to one or more of the TDM, the FDM, or the SDM and transmit the RACH message to the base station based on at least one parameter set and the determined transmission type of the RACH message. In aspects, the configuration received by the UE may be a configuration for transmitting the RACH message based on a RACH determination protocol. The UE may transmit the RACH message to the base station based on the received configuration associated with the RACH determination protocol and the determined at least one transmission type of the RACH message.

What is claimed is: 
     
       1. A method of wireless communication of a user equipment (UE), comprising:
 receiving a configuration for transmitting a random access channel (RACH) message, the configuration associated with a plurality of transmission types including time division multiplexing (TDM), frequency division multiplexing (FDM), and spatial division multiplexing (SDM); 
 determining at least one transmission type of the plurality of transmission types including the TDM, the FDM, and the SDM for the RACH message, the at least one transmission type corresponding to one or more of the TDM, the FDM, or the SDM; 
 transmitting the RACH message based on the received configuration for the RACH message and the determined at least one transmission type of the RACH message; and 
 switching the at least one transmission type for the RACH message from a first transmission type of the plurality of transmission types to a second transmission type of the plurality of transmission types based on a number of retransmission attempts for the RACH message. 
 
     
     
       2. The method of  claim 1 , wherein the at least one transmission type for the RACH message is determined based on a latest occasion of the transmission type for the RACH message. 
     
     
       3. The method of  claim 1 , wherein the at least one transmission type is determined based on at least one of a measurement value for a reference signal received power (RSRP) of a synchronization signal block (SSB) or a channel state information-reference signal (CSI-RS) or a measurement value of a signal-to-interference-plus-noise ratio (SINR) of the SSB or the CSI-RS. 
     
     
       4. The method of  claim 1 , wherein the configuration includes a priority indication for the RACH message, the at least one transmission type determined based on the priority indication. 
     
     
       5. The method of  claim 4 , wherein the priority indication corresponds to a priority of a subscribed service class of the UE. 
     
     
       6. The method of  claim 1 , wherein the at least one transmission type is determined based on a purpose of the RACH message, the purpose corresponding to at least one of an initial access, a beam failure request (BFR), or a timing advance (TA) order. 
     
     
       7. The method of  claim 6 , wherein the initial access is associated with the TDM and each of the BFR and the TA order is associated with at least one of the FDM or the SDM. 
     
     
       8. The method of  claim 1 , further comprising deactivating or activating a full duplex (FD) mode of transmission for the RACH message, the FD mode of transmission corresponding to at least one of the FDM or the SDM, the deactivation or the activation indicated via the received configuration and based on a priority of a downlink (DL) transmission. 
     
     
       9. A method of wireless communication of a base station, comprising:
 transmitting a configuration for a random access channel (RACH) message, the configuration associated with a plurality of transmission types including time division multiplexing (TDM), frequency division multiplexing (FDM), and spatial division multiplexing (SDM); and 
 receiving the RACH message based on the transmitted configuration for the RACH message and at least one transmission type of the plurality of transmission types of the RACH message, the at least one transmission type corresponding to one or more selected ones of the TDM, the FDM, and the SDM, wherein the RACH message is received based on a second transmission type of the plurality of transmission types, the at least one transmission type being switched to the second transmission type from a first transmission type of the plurality of transmission types based on a threshold number of retransmission attempts for the RACH message. 
 
     
     
       10. The method of  claim 9 , wherein the at least one transmission type for the RACH message is based on a latest occasion of the transmission type for the RACH message. 
     
     
       11. The method of  claim 9 , wherein the at least one transmission type is based on at least one of a measurement value for a reference signal received power (RSRP) of a synchronization signal block (SSB) or a channel state information-reference signal (CSI-RS) or a measurement value of a signal-to-interference-plus-noise ratio (SINR) of the SSB or the CSI-RS. 
     
     
       12. The method of  claim 9 , wherein the configuration includes a priority indication for the RACH message, the at least one transmission type based on the priority indication. 
     
     
       13. The method of  claim 12 , wherein the priority indication corresponds to a priority of a subscribed service class of a user equipment (UE) to which the configuration is transmitted. 
     
     
       14. The method of  claim 9 , wherein the at least one transmission type is based on a purpose of the RACH message, the purpose corresponding to at least one of an initial access, a beam failure request (BFR), or a timing advance (TA) order. 
     
     
       15. The method of  claim 14 , wherein the initial access is associated with the TDM and each of the BFR and the TA order is associated with at least one of the FDM or the SDM. 
     
     
       16. The method of  claim 9 , further comprising configuring, based on a priority of a downlink (DL) transmission, a deactivation or an activation of a full duplex (FD) mode of transmission for the RACH message, the FD mode of transmission corresponding to at least one of the FDM or the SDM. 
     
     
       17. An apparatus for wireless communication of a user equipment (UE), comprising:
 a memory; and 
 at least one processor coupled to the memory and configured to:
 receive a configuration for transmitting a random access channel (RACH) message, the configuration associated with a plurality of transmission types including time division multiplexing (TDM), frequency division multiplexing (FDM), and spatial division multiplexing (SDM); 
 determine at least one transmission type of the plurality of transmission types including the TDM, the FDM, and the SDM for the RACH message, the at least one transmission type corresponding to one or more of the TDM, the FDM, or the SDM; 
 transmit the RACH message based on the received configuration for the RACH message and the determined at least one transmission type of the RACH message, wherein the RACH message overlaps with a downlink transmission in a time domain or a frequency domain; and 
 switch the at least one transmission type for the RACH message from a first transmission type of the plurality of transmission types to a second transmission type of the plurality of transmission types based on a number of retransmission attempts for the RACH message. 
 
 
     
     
       18. The apparatus of  claim 17 , wherein to determine the at least one transmission type, the at least one processor is configured to determine the at least one transmission type for the RACH message is based on a latest occasion of the transmission type for the RACH message. 
     
     
       19. The apparatus of  claim 17 , wherein to determine the at least one transmission type, the at least one processor is configured to determine the at least one transmission type based on at least one of a measurement value for a reference signal received power (RSRP) of a synchronization signal block (SSB) or a channel state information-reference signal (CSI-RS) or a measurement value of a signal-to-interference-plus-noise ratio (SINR) of the SSB or the CSI-RS. 
     
     
       20. The apparatus of  claim 17 , wherein the configuration includes a priority indication for the RACH message, the at least one transmission type determined based on the priority indication. 
     
     
       21. The apparatus of  claim 17 , wherein to determine the at least one transmission type, the at least one processor is configured to determine the at least one transmission type based on a purpose of the RACH message, the purpose corresponding to at least one of an initial access, a beam failure request (BFR), or a timing advance (TA) order. 
     
     
       22. An apparatus for wireless communication of a base station, comprising:
 a memory; and 
 at least one processor coupled to the memory and configured to:
 transmit a configuration for a random access channel (RACH) message, the configuration associated with a plurality of transmission types including time division multiplexing (TDM), frequency division multiplexing (FDM), and spatial division multiplexing (SDM); and 
 receive the RACH message based on the transmitted configuration for the RACH message and at least one transmission type of the plurality of transmission types of the RACH message, the at least one transmission type corresponding to one or more selected ones of the TDM, the FDM, and the SDM, wherein the RACH message is received based on a second transmission type of the plurality of transmission types, the at least one transmission type being switched to the second transmission type from a first transmission type of the plurality of transmission types based on a threshold number of retransmission attempts for the RACH message. 
 
 
     
     
       23. The apparatus of  claim 22 , wherein the at least one transmission type for the RACH message is based on a latest occasion of the transmission type for the RACH message. 
     
     
       24. The apparatus of  claim 22 , wherein the at least one transmission type is based on at least one of a measurement value for a reference signal received power (RSRP) of a synchronization signal block (SSB) or a channel state information-reference signal (CSI-RS) or a measurement value of a signal-to-interference-plus-noise ratio (SINR) of the SSB or the CSI-RS. 
     
     
       25. The apparatus of  claim 22 , wherein the configuration includes a priority indication for the RACH message, the at least one transmission type based on the priority indication. 
     
     
       26. The apparatus of  claim 22 , wherein the at least one transmission type is based on a purpose of the RACH message, the purpose corresponding to at least one of an initial access, a beam failure request (BFR), or a timing advance (TA) order.